On Thu, 21 Mar 2013 21:31:19 -0500, Ignoramus3931
wrote:

On 2013-03-22, Pete C. wrote:

Ignoramus3931 wrote:

My guy asked me to cut a 1mm pitch thread on a custom shaft.

I could not do it on my lathe, so I finally bit the bullet and wrote a
subroutine to do threading with my 4th axis rotary table. I use a 60
degree chamfering end mill.

Now I can cut any thread, any pitch, right or left handed, and if the
thread is very coarse, the subroutine does it in several passes.

http://www.youtube.com/watch?v=JMENnIJrl9Y

I am afraid that it does not create a 100% correct thread geometry,
but I hope that I can do enough things with it to be useful with some
adjustments to diameter.

i

Nice, but haven't you found a thread mill for $1 yet?

I have not! But I should start looking.

i

twice now, the auctioneer has called them taps. Makes for a really
good deal, I got one lot of 30 "taps" for $100. Even overheard one guy
saying that guy was crazy bidding $100 on taps.

Karl